Tool for manufacturing wire-tacks and nails



May 3L w32 l J. wlKsci-WRM Ti TOOL FOR MANUFACTURING WIRE TACKS AND NAILS Filed Aug. 18, 195o Jiffy.

Patented May 31, 1932 UNITED- STATES JAKOB WIKSCHTRM, 0F DUSSELDORF, GERMANY TOOLFOR MANUFACTURING WIRE-TACKS AND NAILS l Application led August 18, 1930, Serial No. 475,999, and in Germany September 11, 1929.

My invention relates to tools for vmanufacturing wire-tracks and nails 'by which a piece of wire is provided with a head and a point withoutwaste Tools of this type are equipped with chucking and swaging means for forming the head of the nails, and cutting means for forming the point. The chucking and swaging means includes a pair' of cooperating reciprocating dies or jaws and the cutting means includes a pair of cooperating and reciprocating cutters. v l

It is an object of my invention to improve .a tool of this type. To this end I provide the chucking and swaging means, and also the cutting means, with a pair of circular reciprocating discs, and equip the discs with.A

chucking and swaging elements, and with knives, respectively, on their edges.

It has already been proposed to provide tools having a plurality of chucking and swaging elements, and also a plurality of knives, so that when the elements or knives which have cooperated for a given time, have become worn, they may be exchanged by other elements or knives. In such tools, however, the knives were formed on the end of a circular bar which was adapted to be-rotated about its axis for exchanging the knives. Obviously thespace available for the knives fis limited in such a bar. By providing circular discs according to my invention for the chucking and swaging, and for the cutting means, I may arrange a practically unlimitedv number of elements and knives by suitably selecting the diameter of the discs, and present any desired combination of elements and knives to the blank by rotating the discs.

It is another object of my invention to provide an improved cutter for a tool of the kind described. To thisend I arrange Vthe knives on the edge of the cutter alternately in reversed positions, and preferably so' that each cutting edge forms part of two adjacent knives.

By arranging the knives in the manner i described I obtain two sets of knives on a single cutter which are placed into active l position by turning the cutter through an angle. of 180. By these means, the space .available on the edge of the cutter is utilized to great advantage, and the space economy is further increased by arranging two adjacent knives with a single cutting edge.

The Imachining and grinding of the cutters are also facilitated by the said arrangement.

In the drawings ailixed to this specification and forming part thereof a tool embodying my invention is illustrated diagrammatically by way of example.

In the drawings:

. F ig`. 1 is an elevation showing the chucking and swaging means during swaging, i

Fig. 2 is an elevation showing the cutting means during cutting.

Fig. 3 is a plan View of the four discs constituting the means, with `one of the cutters broken away to show the chucking and swaging disc below,

Fig. 4 shows part of the perimeter of a chucking and swaging disc, and

Fig. 5 shows part ofthe perimeter of a cutter, developed,

Fig. 6 shows a a larger scale,

Fig. is a section on the line VII-VII in Fig. 6,

Fig. 8 is an end elevation, viewed in the direction of the arrow in Fig. 6, and

l Fig. 9 is a perspective illustration of the cutter portion shown in Fig. 6, viewed in the direction of the arrow y, Fig. 6.

Referring now to the drawings, and irst tol Figs. 1 to 3, 1 and 2 are the two chucking and swaging discs, and 3 and 4 are the two cutter disc, 5 and 6 are supports for pins 7 and 8 on which thefdiscs 1 and 2 are mounted to roportion of F ig,`5, drawn to tate, and 9, 10 are supports for the pins 11v Aof the discs l and 2, and l5 are tapered extensions at the ends of the grooves. At the chucking and swaging station S, Fig. 3, two lo',

grooves 14 make up a passagel off'square seccutter is built up tal),

`tion for the reception of the blank 13 and two extensions 15 make up a ta ered depression in which the head of the nail is swaged by a reciprocating plunger 16. 17 is a feed slide by which the nail after its head 18 has been swa is movedinto the position illustrated in Fig. 2, with its end presented to the cutters 3 and 4 which form the point of the nail by means of cutting edges 19A formed 'in their edges as will be described in detail below. The means for operating the supports 5, 6 and 9, 10, the plunger 16 and the feed slide 17, with the means for moving the blank 13 axially, have not been shownas they form no part of the present invention.

Referring now to Figs. 5 to 9, the cutting edges 19 are arranged in converging relation, with their intersectin points 2() alternately at opposite sides of t e cutter as shown for the cutter 4in Fig. 5,but atsomedistance from the faces of the cutter. The faces of the cutter are beveled from the points of intersection as best seen in' Fig. 7 and two short cutting edges 21 and 22 are obtained by milling a V- shaped groove with its ridge 23 extending inwardly from the point of intersection` 'atv an angle to the face of the cutter. By beveling the edges of the cutter from the intersecting points 20, these points are ysupported and braced by the material of the cutter. Without the bevels, the points of intersection would be in the faces of the cutter, and the edges would be very delicate at this point. The faces at the sides of the ridges 23 intersect the faces extending from the two cutting edges 19 at an obtuse angle so that the edges are effectively braced at 20.

Referring now again to Fig. 6, it will a pear from this fi re that t e edge of e om two sets of oppositely directed knives. For instance the cutting edge 1 9 which has been marked a is formed by the inclined faces I and II while the cuttin edge b which intersects the ed a at 20a is ormed by the faces III and c is the cuttin edge which intersects with the cutting g? a at the opposite oint 2Gb and is formed y the faces and The point of the nail is formed by the edges a andb, with Athe faces I and III, and the mating edges and faces of the other cutter. When the` cutters are turned through 180, the point will be formed b the cutting edges a and c, the faces II and and the cooperating elements of the other cutter.

If tapered instead of yramidal points are retuired, the cutting e ges are obtained by mi ling conical grooves into the edges of the cutters. l In order'to exchange two coo rating elements of the chucking and swaging discs 1, 2, and the cutters 3, 4, t e discs are rotated so as to present other elements't-o the blank at-the swiging station S andthe pointing station In order to exchange 'the two sets of knives on the cutter, the cutter is yturned through 180', as mentioned. i

I wish it to be understood that I do not desire to be limited to the exact details of construction shown and describedy for obvious modifications will occur to a person skilled in the art.

In the claims aixed to this s ciication no selection of any particular modification of the .invention is intended to the exclusion of' leased by said chucking and swaging'dies,

said eiucking and swaging dies having headforming cavities and said cutters having recesses with cutting edges formed between them, said cavities an recesses being arranged alternatel in opposite itions with respect to the en faces of sai dies and said cutters.

2. In a machine for making wire tacks and nails, a pair of circular chucking and swaging dies, a pair of circular point cutters, supports on which said dies and cutters are rotatably mounted, means for moving saidsupports with the dies and the cutters in each pair alternately intor and out of relative cooperating position, and means for presenting a blank. to said cutters after it has been released by said chucking and swaging dies, said chucking and swaging dies having headforming cavities and said cutters having re-A cesses. with cutting ed formed between' them, said cavitiesan recesses being arranged alternatel inopposite positions with respect to the en faces of said dies and said cutters.

In testimony whereof I ailix my signature.

J AKOB WIKSCHTRM.

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